I find it's really difficult to stay on top of an open source project by myself.
The last real commit I made to Seaglass that wasn't merging a PR was in September. For weeks and weeks I worked on Seaglass, day in day out, with what seemed like unlimited motivation. Then I hit a wall, and it's been incredibly difficult to go back to. Burn-out.
Meanwhile I've been working more steadily on Yggdrasil, which is easier not least because I am not the only developer. Changes come small and often.